Performance issues with 2x 6870 crossfire. Help!

[leblanc93]

I just bought a second Sapphire HD 6870 to compliment the one I bought just a couple months ago. GPU-z has been recognizing both cards, so I was expecting to see a performance increase in my games. WRONG!

I have noticed that my games have been performing much better when I disable crossfire. In every game I try (I have tried about 10-15 different games from my steam library), my FPS is about 10-20 less with crossfire, as will as being a lot more stuttery.

I have done a clean sweep with DriverSweeper in safe mode, downloaded the latest CAP for 11.12, and disabled all of my OC'ing. What am I missing?

Specs:
CPU: AMD FX4100 @ Stock(OC'd to 4.4GHz before I started troubleshooting this problem!)
Mobo: MSI 990XA-GD55
PSU: SILVERSTONE Strider Essential series ST60F-ES 600W (42A on the 12v rail)
OS: W7 64bit
RAM: 16gb Corsair Vengeance

 

[amuffin]

Bottlenecking :S Spend 30 bucks and get a hyper 212 evo and overclock!!!!!!!!!!!!!!

 

[leblanc93]

Bottlenecking :S Spend 30 bucks and get a hyper 212 evo and overclock!!!!!!!!!!!!!!

I am aware that buying one of the new bulldozers was a very bad idea, but that doesn't help explain the decrease in performance at all. I would understand my FPS staying the SAME if bottlenecking was the only problem here, but it isn't. It's literally lowering the performance.

 

[amuffin]

Because your cpu can't keep up with 2 6870, but it can keep up with 1.

 

[leblanc93]

Because your cpu can't keep up with 2 6870, but it can keep up with 1.

Hmm. Overclocking doesn't seem to change much. I had it going steady at 4.4GHz before I disabled it. Could it be my PSU?

 

[hiimnickwhoareu]

You sir might need to join us intel fanboys. Say what you will, but deep down you know the 2500k is calling your name.

 

[randomkid]

Hmm. Overclocking doesn't seem to change much. I had it going steady at 4.4GHz before I disabled it. Could it be my PSU?

Did you download & installed the Catalyst Application Profile (cap)?
http://downloads.guru3d.com/AMD-Catalyst-Application-Profile---11.8-CAP5-download-2782.html
http://sites.amd.com/us/game/downloads/pages/crossfirex-app-profiles.aspx

 

[leblanc93]

You sir might need to join us intel fanboys. Say what you will, but deep down you know the 2500k is calling your name.

I can honestly say that I wish I had the means to make an intel build. I am a starving college student. That's why the FX series looked so appealing. The one time I don't look up benchmarks, right?

If I could do it all over, I would be rocking a 2500k, BUT! There's no way I can afford a new mobo AND a 2500k at this point in my life.

Any more ideas anyone? I still think my PSU may be part of the problem. After re overclocking I'm getting crashes, start-up issues, and BSODS.

Power supply??? Anyone??? ANYONE?!

 

[4745454b]

Did you test the second/new card by itself to make sure its working correctly?

 

[guavasauce]

get the 12.1 preview drivers, worked for me.

 

[leblanc93]

Did you test the second/new card by itself to make sure its working correctly?

I did try that, thanks. It's working just fine. Also, both of my pci-e slots are x16, so no problems there.

 

[leblanc93]

get the 12.1 preview drivers, worked for me.

How similar was your problem in comparison to mine? Same cards? Same cpu? A little more info would really help me out.

 

[david1006]

yes i have the same problem here 2 6870CF bad Performance and have a fx 8120 and i have a AMD Phenom II X4 OC at 4.1GHz and still get bad Performance its low gpu usage ever one who have 6870CF seem to have the same problem i think its the driver catalyst but some games like BF3 you will get much better Performance.